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May 27, 2016
Friday, May 27
Colloquium
Time: 14:30
Speaker: Chris Hall (University of Wyoming)
Title: "Expander and Ramanujan Graphs"
Room: MC 107

Abstract: I will define expander and Ramanujan graphs and give a variety of existence results. Most notably I will state a joint result of D. Puder, W. Sawin, and myself on so-called Ramanujan covers of graphs. Our result generalizes one of several recent celebrated joint results of A. Marcus, D. Spielman, and N. Srivastava.